How can recycling materials lead to environmental sustainability? a. recycling materials decrease the amount of new materials taken from the environment. b. recycling materials increase the rate of carbon sequestration. c. by recycling materials, the amount of biomass available for energy purposes is increased. d. all of the above

Avehicle has an oil leak that is causing the entire oil pan to be wet, but inspection reveals no exact source after cleaning off the oil residue. technician a says to install a fluorescent dye in the crankcase and operate the engine, then re-inspect for leaks with a special light (black light). technician b says the oil leak may be coming from a source at the top of the engine, such as a valve cover gasket. who is correct?

Could someone . i have tried to solve myself but my calculation is off

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?